I can’t seem to work out what the issue is here.
My PC restarts halfway through the Windows or Linux boot process, and Linux live discs restart the PC as soon as I touch the keyboard to choose a boot option. However, the memtest86 option on the HDD’s Grub2 menu boots and runs fine, and doesn’t shut off after several hours of memory testing. This is all with every possible component disconnected (no HDD when booting live).
So I can’t work out what’s wrong, but I’ve narrowed it down to either the CPU or motherboard being at fault since the RAM tests fine and works in other systems. If it’s just the motherboard I can afford to fix it, but if I need a new CPU I’ll be transferring everything to my laptop. So other than buying a new motherboard, how can I discern whether it’s a faulty motherboard or faulty CPU? (I have no other 1155 motherboards/CPUs to test with).